مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2600
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn 'Abbas (رضي الله عنه) said: The Messenger of Allah (ﷺ) said: “Do not fast Friday on its own."
Musnad Ahmad 2615Saheeh because of corroborating evidence; this is a da'eef i